diff --git a/Atari/gr_basics.asm b/Atari/gr_basics.asm
index 6c8691f..5a75e8e 100644
--- a/Atari/gr_basics.asm
+++ b/Atari/gr_basics.asm
@@ -463,20 +463,21 @@ Fast    ; Put char without coordinates check!
 
     ; and 8 bytes to the table
     ldy #7
+    ldx #$ff ; otimization - thanks @Irgendwer
 CopyChar
+    txa ; $ff
+    sta char2,y
     lda (fontind),y
     eor #$ff
     sta char1,y
-    lda #$ff
-    sta char2,y
     dey
     bpl CopyChar
     ; and 8 subsequent bytes as a mask
     adw fontind #8
     ldy #7
 CopyMask
-    lda (fontind),y
-    eor #$ff
+    txa ; $ff
+    eor (fontind),y
     sta mask1,y
     lda #$00
     sta mask2,y
diff --git a/C64/gr_basics.asm b/C64/gr_basics.asm
index 860ae9d..831d814 100644
--- a/C64/gr_basics.asm
+++ b/C64/gr_basics.asm
@@ -344,20 +344,21 @@ Fast    ; Put char without coordinates check!
 
     ; and 8 bytes to the table
     ldy #7
+    ldx #$ff ; otimization - thanks @Irgendwer
 CopyChar
+    txa ; $ff
+    sta char2,y
     lda (fontind),y
     eor #$ff
     sta char1,y
-    lda #$ff
-    sta char2,y
     dey
     bpl CopyChar
     ; and 8 subsequent bytes as a mask
     adw fontind #8
     ldy #7
 CopyMask
-    lda (fontind),y
-    eor #$ff
+    txa ; $ff
+    eor (fontind),y
     sta mask1,y
     lda #$00
     sta mask2,y
diff --git a/grafproc.asm b/grafproc.asm
index 4d13726..9e9ff81 100644
--- a/grafproc.asm
+++ b/grafproc.asm
@@ -584,11 +584,14 @@ UnequalTanks
 ;-------------------------------------------------
 .proc ClearTanks
     jsr PMoutofScreen
-    mva #1 Erase    ; erase tanks flag
+    lda #1     ; erase tanks flag
+    bne drawtanks.era
 .endp
 ;-------------------------------------------------
 .proc drawtanks
 ;-------------------------------------------------
+    lda #0    ; no erase tanks flag
+era sta Erase
     lda TankNr
     pha
     ldx #$00
@@ -604,7 +607,6 @@ DrawNextTank
     pla
     sta TankNr
 
-    mva #0 Erase    ; no erase tanks flag
     rts
 .endp
 ;---------
diff --git a/scorch.xex b/scorch.xex
index db5b702..f5a66ff 100644
Binary files a/scorch.xex and b/scorch.xex differ
diff --git a/scorchC64.prg b/scorchC64.prg
index 3c65015..917f471 100644
Binary files a/scorchC64.prg and b/scorchC64.prg differ